Bear Joseph C, Gomez Virginia, Kefallinos Nikolaos S, McGettrick James D, Barron Andrew R, Dunnill Charles W
Energy Safety Research Institute (ESRI), College of Engineering, Swansea University, Bay Campus, Fabian Way Swansea SA1 8EN, UK.
SPECIFIC, College of Engineering, Swansea University, Baglan Bay Innovation and Knowledge Centre, Central Avenue, Baglan, Port Talbot SA12 7AX, UK.
J Colloid Interface Sci. 2015 Dec 15;460:29-35. doi: 10.1016/j.jcis.2015.08.027. Epub 2015 Aug 19.
Titanium dioxide (TiO2) bi-phasic powders with individual particles containing an anatase and rutile hetero-junction have been prepared using a sequential layer sol-gel deposition technique to soluble substrates. Sequential thin films of rutile and subsequently anatase TiO2 were deposited onto sodium chloride substrates yielding extremely fragile composite layered discs that fractured into "Janus-like" like powders on substrate dissolution. Nitrogen doped and platinum sputtered analogues were also prepared, and analysed for photocatalytic potential using the photodegradation of Rhodamine B, a model organic pollutant under UV and visible light irradiation. The materials were characterised using X-ray diffraction, X-ray photoelectron spectroscopy, energy dispersive X-ray spectroscopy, Raman spectroscopy and scanning electron microscopy. This paper sheds light on the relationship between anatase and rutile materials when in direct contact and demonstrates a robust method for the synthesis of bi-phasic nanoparticles, ostensibly of any two materials, for photocatalytic reactions or otherwise.
采用连续层溶胶 - 凝胶沉积技术，在可溶性基底上制备了具有锐钛矿和金红石异质结的单相二氧化钛（TiO₂）粉末。先在氯化钠基底上沉积金红石的连续薄膜，随后沉积锐钛矿TiO₂，得到极其脆弱的复合层状圆盘，在基底溶解时会破碎成“类雅努斯”粉末。还制备了氮掺杂和铂溅射的类似物，并通过对罗丹明B（一种典型有机污染物）在紫外光和可见光照射下的光降解来分析其光催化潜力。使用X射线衍射、X射线光电子能谱、能量色散X射线光谱、拉曼光谱和扫描电子显微镜对材料进行了表征。本文揭示了直接接触时锐钛矿和金红石材料之间的关系，并展示了一种稳健的方法来合成表面上由任意两种材料组成的双相纳米颗粒，用于光催化反应或其他用途。
